Flush valve



July 23, 1929. c. D. MYER 1,722,155-

PLusn wgLvE Filed Aug. 6, 1926' INVENTOR Claw/,6.27. wel" ATTORNEYSPrtented July 23, 1929.

UNITE YFFCE.`

CLAUS D. MYER, OF UNION CITY, NEW JEBSEY, ASSIGNOR TO MYER FLUSH VALVECO., INC., OF UNION CITY, I\TEW,YERSEY, A. CORPORATION VOIF NEW JERSEY.i.

:FLUSH VALVE.

Application filed August 6, 1926. Serial No. 127,670. l

tarding the return of a valve after it has been unseated. p

,y This type of pressure flush valve has been subject to severaldisadvantages. In the first place, in most of them7 Ithe valve chamberis formed with an eXpansible wall in the nature vof a rubber diaphragm;such diaphragms may work eiiiciently when only clean filtered water ispassing through the valve. Y For marine purposes however, and in variousother connections where the water l passing through the .valve is dirty,or carries sand or silt, the highv water pressures grind the Sandorother foreign matter into the diaphragm, and the diaphragm is quicklyworn through.` v

A further disadvantage of the flush valves now commonly employed is thefact that no satisfactory means has ever been provided for accuratelyregulating the time interval for which the valve is open, or forpredetermining the amount of time which it will take for the valve toreseat. I

In accordance with the present invention I have provided a valve whichis particularly suitable for use in marineworl, on shipboard, at docks,or in any location where dirty water is` present in the pressure line.My valve entirely eliminates the use of the diaphragm, and substitutestherefor a metal wall capable of resisting the., attacks of foreignmatter which may be forced against it by the pressure of the water. Theinvention also provides readily adjustable means yfor regulating theinterval between the opening and closing of thevalve, or regulating theamount of time which it takes-the valve to reseat after it has beenreleased.

Further objects of the invention are to provide a valve of simple,practical construction, which will be rugged, durable and etlicient inuse, which may be manufactured with comparative economy, which `may beoperated with facility, and which is eX- tremely unlikely to becomeinoperative due to the passage of foreign matter therethrough.

`With the above noted and other objects in zview7 the invention consistsin certain novel features of construction and combinations .andarrangements of parts, as will be more fully hereinafter set forth andpointed out .inthe claims. The invention may be more fully understoodfrom the following description in connection with the accompanyingdrawings, whereiny Fig. 1 is a view in side elevation of a flush yalveembodying ythe present invention, part Vof the cylinder being brokenaway to disclose the bypass passageway.. i'

Fig. 2 is an enlarged view in vertical section through the-valve on theline 2`-2 ofV Fig. 3 is a transverse sectional view onthe line 3,-3 ofFig. 2. Y l y Fig. l is a vertical sectional detail through the upperend ofthe cylinder showing the retarding piston in its uppermostposition. IIn the drawings I vhave used the numeral to designate a valvecasing formed with an inwardly turned valve seat 11 communieating withan" external nipple 12. lVater under pressure enters the valveV casing10 through an inlet pipe 13 and when the valve 111 is open, passes intothe tank tobe flushed through anoutlet pipe 15connected to the nipple12. rValve 14 coacting with vthe seat 11 is preferably guided by adepending vspider 16. f The stem 17 of the valve passes upwardly througha closed cylinder 18 secured in any appropriate manner, to the open topof the' valve casing 10. It will be noted that the lower end of thecylinder is flanged at 19, and bolted or otherwise secured as at 21- toa flange on the valve body l0. rIhe upper iianged end 22"of the cylinder18 mates with a flange 23-on'a dome-like cylinder head 24. The lowercylinder head'25 constitutesy also the top-wall` of the valve chamber,and is formed' withv a boss 26 in which the valve stem 17 loosely fits.y The stem 17 is soloosely fittedV into boss 26 that water may leakaround the stem into v the cylinder' 18, the ycylinder becomingcoinpletely filled withl water after. a few operations of the valve. s v

The dome-like cylinder head l24C` is provided with a stuiiing boX` 27 inwhich the 4 upper end of the valve stem is guided. Any

suitable means may be provided for operating the valve stem, suchfor-instance as the d tarding piston 31 having openings 32 therein.

A fiat rcheck valve 33 at the under side of the piston prevents flow ofwater upwardly through the openings v32 as the piston moved downwardly,but permits, free passage of water through the piston as the valve stein17 is lifted.

A coiled expansion lspring 341 encircling the valve stem 17 bearsagainst 'the piston 31 and tends to urge the valve into the seatedposition' of Fig. 2.

A restricted water passage 35 formed in a llaterally offset portion 36of the cylinder 18 communicates at its lower end through a passage 3G?Lwith the bottom of the cylinder 18 ata point below the piston.Passageway 35 is connected to the upper end of the cylin der at a pointabove the piston by a restricted passageway 37 aligned with a needlevalve 38 mounted in the wall of they offset 36.

The operation of the device isA substantially as follows: water under.pressure always fills the valve chamber and will leak around' the valvestem into the' cylinder 18` until this cylinder, as well as the passages35, 36 and 37 are completely illed. To unseat thevalve 14, lthe lever 28is depressed, lifting' the valve against the actionV of its spring 34.As the valve'is lifted, piston 31 will move upwardly `with the valvestein, check valve dropping away from the openings 32 and permittingfree upward movement of the retarding piston. I

y As the handle 28 is released, the spring 34 will tend to rese'at vthevalve. Piston 31 however, is retarded in downward move- In'ent due tothe factthat the check valve 33 blocksV passages 32. Consequently,downward movement of the piston is vregulated by the rate at which watermay be forced through the passages 36a, 35 and 37 from the bottom of thecylinder to the' top thereof, or from one side of 'the piston' to theother. The rate of flow through passage 35 is predetermined of course bythe cross sectional area of the passage.` By the simple expedient ofadjusting the needle valve 38 the rate of flow may be accuratelypredetermined and any desired amount of time may elapse between thereleaseof the handle 28 and the reseating of the `valve lil, itbeingborne in mind that until the valve reseats, water under pressure willcontinue to flow out through the pipe 15. j

The lower metallic cylinder head 25 takes the place of the rubberdiaphragm ordinarily employed, and' will of course wear-'much betterthan the diaphragm., inasmuch as it is not subject to damage by theaction of silt, sand or other foreign matter passing through thepressure line.' *Y y' V Y` Tle particular details of construction of thepiston 31.1nay'be considerably varied, and in factnumerous changes andalterations might be made in the general form and arrangements of theparts describedV without departing from the invention. Hence IV do notwish to limit myself to the precise details set forth, but shallconsider myself at liberty to make such changesandalterations as fairlyfall within the spirit and scope of the appended claims.

I claim: 1 Y

1. A flush valve' for pressure lines including a valve casing havinginlet and outlet ports therein and avalve seat intermediate the ports, acylindrical valve bonnet having a closed lower end secured to andconstituting the top of the'valve casing, valve the casing cooperatingwith the seat, and a valve stem working` loosely through opening in theclosed bottom of the cylindrical bonnet, a dom'ec'losing the top of thecylindrical bonnet and having a stuffing box therein through which the'valve' stein works', a piston secured to the' stern within" the bonnetand a` check valve vassociated with the piston permitting free flow ofliquid through the piston as thevalve is opened' and preventing Howtherethrough as' the 'valve is closed, a spring 'above the' piston`actir'ig thereon to' close the valve', and by-pass means' connecting`the 'water sp'aces at opposite sides of the piston. y

2. A flush valve for pressure lines including avalve casing having inletandV outlet ports therein and a'val've seat intermediate the ports, acylindrical vvalve' bonnet having a closed lower'end ,secured to andconstituting the top of the fvalve' casing, a' valve in' the casingcooperating with the seat, and' a' valve stem working loosely 'througha'n opening in the closed bottom 'of the `cylin'drical bonnet, a domeclosing the top' ofthe cylindrical bonnet and having a stuffing boxtherein through which the valve 'stern works, a piston secured to thesternwithinthe bonnet `and a check valve' associated V'with the pistonpermitting free How of 'liquid through the piston as the' valve' isvopened and preventing 'flow therethrough as the valve is closed, aspring above the piston act-ing thereon to close the valve, andbypassmeans connecting the water'space's at 'opposite sides ofthe piston',said by-pass passageway being formed in the wall of the Vcylindricalbonnet.'k y

3. A flush valve for pressurelines' including a valve casing`having'inlet and outlet ports therein 'and a valve seat intermediate theports, a cylindrical valvel bonnet having a closed lower end vsecured toand constituting the top of the valve casing, a valve in the casingcooperating with theseat, and a valve stem working loosely through anopening in the closed bottom` of the cylindrical bonnet, a dome closingthe top of the cylindrical lbonnet and having a stuffing box thereinthrough which the valveV stem works, a piston secured to the sternwithin 'iso the bonnet and a check valve associated with the pistonpermitting free How of liquid through the piston as the valve is openedand preventing flow therethrough as the valve is closed, a spring abovethe piston acting thereon to close the valve, and by* pass meansconnecting the lwater spaces at opposite sides of the'piston, said`by-pass passageway being formed in the wall of Athe cylindrical bonnet,and a needle valve adjustable from the exterior of the bonnet regulatingthe flow of water through the by-pass.

4. A lush valve for pressure lines including a valve casing having inletand outlet ports therein and a valve seat intermediate the ports, acylindrical valve bonnet having la closed lower end secured to andconstituting the top of the valve casing, a valve in the casingcooperating with the seat, and a valve stem working loosely through anopening in the closed bottomv of the cylindrical bonnet, a dome closingthe top of the cylindrical bonnet and having a stuffing box thereinthrough which thevalve stem works, a piston secured to the stem withinthe bonnet and a check valve associated with the piston permitting freeflow of liquid through the piston as the valve is opened and preventingflow therethrough as the valve is closed, va spring above the pistonacting thereon to close the valve, and by-pass means connecting thewater spaces at opposite sides of the piston, a ring secured to thevalve stem below the piston, said check valve comprising a floating ringworking between the piston and the above mentioned ring and acting toseal openings in the piston as the latter moves in a direction to closethe main valve.

CLAUS D. MYER. v

